James ward packard



(N0 Model.)

J. W. PACKARD.

REVOLVING PHOTOMETER STAND.

Patented Jan. 29, 1889.

'INVEN OBI,

WITNESSES:

' ATTORNEY.

N. PETERS. Phnlc-Llmngnpher. Washmglnn. m;

-UNITED STATES PATENT OFFICE.

JAMES WARD PACKARD, ()F NEIY YORK, Y.

REVOLVING PHOTOMETER-STAND SPECIFICATION forming part of Letters PatentNo. 396,951, dated January 29, 1889.

Application filed May 19, 1388. Serial No. 274,435. (No model.)

To all whom it may concern.-

Be it known. that I, JAMES WARD PACKARD, a citizen of the United States,residing at New York, in the county of New York and. State of New York,have invented certain new and useful Improvements in RevolvingPhotometer- Stands; and I dohereby declare the following i to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appcrtains to make and use thesame.

My invention consists in a revolving pho clip by which the revolvingportion of the stand may be locked in certain positions.

In the manufacture of incandescentelectric lamps it is necessary tocalibrate each lamp to determine either its candle-power with a standardcurrent or the. amount of current necessary to give it a standardcandlepower. To facilitate this operation I have designed the followingapparatus, in which i X, Fig. 2, is the table to which the standard S isscrewed. \Vithin the standard is a vertically-adjustablc spindle, A,held in position by the thumb-screw N. Upon the upper end of the spindleA is a revolving bearing, upon which two or more arms,P I of insulatingmaterial, are fastened in any suitable manner. At the outer end of eacharm is a lainpsocket, M M. Within these sockets are ren'iovably placedthe lamps 1. Cables formed of two electric wires insulated one from theother, and designated by the letters E E in Fig. 2, connect theelectrodes of each lampsocket with the binding-screws D F and I) F oneach of the revolving arms, respectively.

The bimling-screw D is connected with the contact-piece Y and thebinding-screw F with the contact piece or brush II. In the same way Dand F are connected, respectively,

with Y and II. The stationary contactpiece is held to the top of thespindle A by r the set-screw B and electrically connected with the saidspindle. At a point/below the revolving arms the rubber ring, shownclearly in I ig. 3, is fastened to the standard A, and the contact-pieceI is thus fastened to the said spindle, but insulated therefrom. Uponthe contact-piece I is thebinding-screw K. These contactrpieccs may berigid or they may be 1 of a yieldingnature, such as well-known forms of.contact-brushes, contact-springs, etc.

The bearing Q, (shown in detail in Fig. 41,) to which the arms I and I?are fastened, has .a spring-clip, T. (Clearly shown in Fig. 4.) Thisspring-clip drops into one or other of the notches Y upon the spindle A,as shown in. Fig. 2, whenever a lamp, as Z, is in position to becalibrated, as indicated in Fig. l.

The electrical connections are as follows: The current enters throughthe connection \V, as shown in Fig. 2. It follows the directionsindicated by the arrows through the standard S, spindle A, contactpieceC, contact-piece Y, the binding-scrt-nv ID, through one wire of thecable E, through the lamp circuit Z, back through the other wire of thecable E, the binding-screw F, the contact piece or brush II,eontactspiece I, the bindingscrew K, and the wire \V,to the otherterminal of the external circuit.

Fig. I shows the stamlard lamp Ti and the photomcter-raek R with itsscale and the sliding gage G, which has its two pieces of oil-paper andthe disk of opaque material between them, in. the manner customary inphotometers of this type.

In operation one man can devote all his attention to the photometer andthe variable resistance which determines the calibration of thelampwhich is in line with the photometer while another operator is removinganother lamp already calibrated and placing a third in the socket thusvacated. \Vhen this operation completed, the spring-clip T is lifted andthe stand revolved until it looks in. position for a repetiti on of theoperation.

\Vhile I have shown but two arms in the revolving portion of the stand,it is evident that three or more might be used without in any wayvarying my invention or requiring such changes in construct-ion asnecessitate further illustration.

Having therefore described my invention, both in essence and detail,what I claim as new, and desire to protect by Letters Patent,

1. A revolving photometer-stand which has the following parts incombination: two revolving arms, each of which carries a socket for anelectric lamp, a set of two contactpieces on each arm and connectionsbetween the contact-pieces and the electrodes of the lamp-socket,together with a standard which has two stationary contact-piecesinsulatedone from the other and corresponding to the sets ofcontact-pieces on the revolving arms, which stationary contact-piecesform the terminals of an external electric circuit, substantially asdescribed.

2. Arevolvingphotometer-stand which has the following parts incombination: two revolving arms, each of which carries a socket for anelectric lamp, a set of two contactpieces on each arm, and connectionsbetween these contact-pieces and the electrodes of the lamp-socket,together with a standard'which has two stationary contact-piecesinsulated one from the other and corresponding to the sets of thecontact-pieces on the revolving arms, and a spring-clip for lockin g therevolving arms in one position when the stationary contact-pieces touchany one of the revolving sets of contact-pieces, substantially asdescribed.

3. The combinatiomina photometer, of the stationary standardlamp, thesliding gage, and the revolving photometer-stand, which has sockets fortwo lamps, whereby while one lamp is being calibrated a second lamp maybe removed and a third substituted in its place, substantially asdescribed.

a. The combination, in a photometer, of the stationary standard lamp,the 'sliding gage, and the revolving photometer-stand, which has socketsfor two lamps and electric connect-ions for the same, whereby while onelamp is being calibrated a second lamp may be removed and a thirdsubstituted in its place, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES \VART) PACKARD.

.\\'itnesses:

CHAs. H. SoNN, J'No. M. ROBERTSON.

